
class DefaultSeqCreator {
    value = 100;
    uuidString = "";

    constructor() {
        let uuid = guid();
        this.uuidString = uuid;
    }

    create() {
        ++this.value;
        return this.uuidString + this.value;
    }
}

function guid() {
    return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function (c) {
        var r = Math.random() * 16 | 0,
            v = c == 'x' ? r : (r & 0x3 | 0x8);
        return v.toString(16);
    });
}